Mind Changers (Radio 4) was crisply put together, yet quietly terrifying. "Context taints all," we heard in this re-examination of David Rosenhan's 1972 Pseudo-Patient experiment, in which nine sane people got themselves admitted to psychiatric hospitals. Rosenhan himself took part, and his medical notes recorded how he spent a lot of time writing; a symptom of his illness, it was assumed.

Even if you knew about the experiment, there were pleasing twists and turns here. I liked the student who was desperate to be included but too young – Rosenhan told him, "I can get you in but I can't get you out" – and also the hospitals' responses to the trickery. They claimed to have spotted 41 more fake patients afterwards. "In fact," we were told, "Rosenhan had sent none."

Joan Armatrading's Favourite Guitarists (Radio 4) is a curious experiment, too, sliced into five daily snippets and never quite getting going. I'd rather an hour about Armatrading herself than a brief chat with, say, Mark Knopfler about how he "arrived at the Mark Knopfler style of playing". This wasn't rigorous analysis either. "It's a great sound," suggested Armatrading. "I think so," Knopfler concurred.